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<FONT color="green">001</FONT>    /*<a name="line.1"></a>
<FONT color="green">002</FONT>     * Copyright 2007 the original author or authors.<a name="line.2"></a>
<FONT color="green">003</FONT>     *<a name="line.3"></a>
<FONT color="green">004</FONT>     * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<FONT color="green">005</FONT>     * you may not use this file except in compliance with the License.<a name="line.5"></a>
<FONT color="green">006</FONT>     * You may obtain a copy of the License at<a name="line.6"></a>
<FONT color="green">007</FONT>     *<a name="line.7"></a>
<FONT color="green">008</FONT>     *      http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<FONT color="green">009</FONT>     *<a name="line.9"></a>
<FONT color="green">010</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<FONT color="green">011</FONT>     * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<FONT color="green">012</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<FONT color="green">013</FONT>     * See the License for the specific language governing permissions and<a name="line.13"></a>
<FONT color="green">014</FONT>     * limitations under the License.<a name="line.14"></a>
<FONT color="green">015</FONT>     */<a name="line.15"></a>
<FONT color="green">016</FONT>    package org.codehaus.groovy.grails.plugins.searchable.lucene;<a name="line.16"></a>
<FONT color="green">017</FONT>    <a name="line.17"></a>
<FONT color="green">018</FONT>    import org.apache.commons.logging.Log;<a name="line.18"></a>
<FONT color="green">019</FONT>    import org.apache.commons.logging.LogFactory;<a name="line.19"></a>
<FONT color="green">020</FONT>    import org.apache.lucene.analysis.Analyzer;<a name="line.20"></a>
<FONT color="green">021</FONT>    import org.apache.lucene.analysis.Token;<a name="line.21"></a>
<FONT color="green">022</FONT>    import org.apache.lucene.analysis.TokenStream;<a name="line.22"></a>
<FONT color="green">023</FONT>    import org.apache.lucene.analysis.standard.StandardAnalyzer;<a name="line.23"></a>
<FONT color="green">024</FONT>    import org.apache.lucene.queryParser.QueryParser;<a name="line.24"></a>
<FONT color="green">025</FONT>    import org.apache.lucene.queryParser.ParseException;<a name="line.25"></a>
<FONT color="green">026</FONT>    import org.apache.lucene.search.Query;<a name="line.26"></a>
<FONT color="green">027</FONT>    import org.apache.lucene.index.Term;<a name="line.27"></a>
<FONT color="green">028</FONT>    import org.compass.core.util.Assert;<a name="line.28"></a>
<FONT color="green">029</FONT>    <a name="line.29"></a>
<FONT color="green">030</FONT>    import java.io.IOException;<a name="line.30"></a>
<FONT color="green">031</FONT>    import java.io.StringReader;<a name="line.31"></a>
<FONT color="green">032</FONT>    import java.util.*;<a name="line.32"></a>
<FONT color="green">033</FONT>    <a name="line.33"></a>
<FONT color="green">034</FONT>    /**<a name="line.34"></a>
<FONT color="green">035</FONT>     * Lucene utils<a name="line.35"></a>
<FONT color="green">036</FONT>     *<a name="line.36"></a>
<FONT color="green">037</FONT>     * @author Maurice Nicholson<a name="line.37"></a>
<FONT color="green">038</FONT>     */<a name="line.38"></a>
<FONT color="green">039</FONT>    public class LuceneUtils {<a name="line.39"></a>
<FONT color="green">040</FONT>        private static final Log LOG = LogFactory.getLog(LuceneUtils.class);<a name="line.40"></a>
<FONT color="green">041</FONT>        public static final String SPECIAL_QUERY_CHARACTERS = "\\+-!():^[]\"{}~*?";<a name="line.41"></a>
<FONT color="green">042</FONT>    <a name="line.42"></a>
<FONT color="green">043</FONT>        /**<a name="line.43"></a>
<FONT color="green">044</FONT>         * Returns a list of terms by analysing the given text with Lucene's StandardAnalyzer<a name="line.44"></a>
<FONT color="green">045</FONT>         *<a name="line.45"></a>
<FONT color="green">046</FONT>         * @param text the text to analyse<a name="line.46"></a>
<FONT color="green">047</FONT>         * @return a list of text terms<a name="line.47"></a>
<FONT color="green">048</FONT>         */<a name="line.48"></a>
<FONT color="green">049</FONT>        public static String[] termsForText(String text) {<a name="line.49"></a>
<FONT color="green">050</FONT>            return termsForText(text, (Analyzer) null);<a name="line.50"></a>
<FONT color="green">051</FONT>        }<a name="line.51"></a>
<FONT color="green">052</FONT>    <a name="line.52"></a>
<FONT color="green">053</FONT>        /**<a name="line.53"></a>
<FONT color="green">054</FONT>         * Returns a list of terms by analysing the given text<a name="line.54"></a>
<FONT color="green">055</FONT>         *<a name="line.55"></a>
<FONT color="green">056</FONT>         * @param text the text to analyse<a name="line.56"></a>
<FONT color="green">057</FONT>         * @param analyzerClass the Analyzer class to use, may be null in which case Lucene's StandardAnalyzer is used<a name="line.57"></a>
<FONT color="green">058</FONT>         * @return a list of text terms<a name="line.58"></a>
<FONT color="green">059</FONT>         */<a name="line.59"></a>
<FONT color="green">060</FONT>        public static String[] termsForText(String text, Class analyzerClass) {<a name="line.60"></a>
<FONT color="green">061</FONT>            if (analyzerClass == null) {<a name="line.61"></a>
<FONT color="green">062</FONT>                return termsForText(text, (Analyzer) null);<a name="line.62"></a>
<FONT color="green">063</FONT>            }<a name="line.63"></a>
<FONT color="green">064</FONT>            try {<a name="line.64"></a>
<FONT color="green">065</FONT>                return termsForText(text, (Analyzer) analyzerClass.newInstance());<a name="line.65"></a>
<FONT color="green">066</FONT>            } catch (Exception ex) {<a name="line.66"></a>
<FONT color="green">067</FONT>                // Convert to unchecked<a name="line.67"></a>
<FONT color="green">068</FONT>                LOG.error("Failed to create instance of Analyzer class [" + analyzerClass + "]: " + ex, ex);<a name="line.68"></a>
<FONT color="green">069</FONT>                throw new IllegalStateException("Failed to create instance of Analyzer class [" + analyzerClass + "]: " + ex);<a name="line.69"></a>
<FONT color="green">070</FONT>            }<a name="line.70"></a>
<FONT color="green">071</FONT>        }<a name="line.71"></a>
<FONT color="green">072</FONT>    <a name="line.72"></a>
<FONT color="green">073</FONT>        /**<a name="line.73"></a>
<FONT color="green">074</FONT>         * Returns a list of terms by analysing the given text<a name="line.74"></a>
<FONT color="green">075</FONT>         *<a name="line.75"></a>
<FONT color="green">076</FONT>         * @param text the text to analyse<a name="line.76"></a>
<FONT color="green">077</FONT>         * @param analyzer the Analyzer instance to use, may be null in which case Lucene's StandardAnalyzer is used<a name="line.77"></a>
<FONT color="green">078</FONT>         * @return a list of text terms<a name="line.78"></a>
<FONT color="green">079</FONT>         */<a name="line.79"></a>
<FONT color="green">080</FONT>        public static String[] termsForText(String text, Analyzer analyzer) {<a name="line.80"></a>
<FONT color="green">081</FONT>            try {<a name="line.81"></a>
<FONT color="green">082</FONT>                if (analyzer == null) {<a name="line.82"></a>
<FONT color="green">083</FONT>                    analyzer = new StandardAnalyzer();<a name="line.83"></a>
<FONT color="green">084</FONT>                }<a name="line.84"></a>
<FONT color="green">085</FONT>                TokenStream stream = analyzer.tokenStream("contents", new StringReader(text));<a name="line.85"></a>
<FONT color="green">086</FONT>                ArrayList terms = new ArrayList();<a name="line.86"></a>
<FONT color="green">087</FONT>                Token token = new Token();<a name="line.87"></a>
<FONT color="green">088</FONT>                while (true) {<a name="line.88"></a>
<FONT color="green">089</FONT>                    token = stream.next(token);<a name="line.89"></a>
<FONT color="green">090</FONT>                    if (token == null) break;<a name="line.90"></a>
<FONT color="green">091</FONT>    <a name="line.91"></a>
<FONT color="green">092</FONT>                    terms.add(new String(token.termBuffer(), 0, token.termLength()));<a name="line.92"></a>
<FONT color="green">093</FONT>                }<a name="line.93"></a>
<FONT color="green">094</FONT>                return (String[]) terms.toArray(new String[terms.size()]);<a name="line.94"></a>
<FONT color="green">095</FONT>            } catch (IOException ex) {<a name="line.95"></a>
<FONT color="green">096</FONT>                // Convert to unchecked<a name="line.96"></a>
<FONT color="green">097</FONT>                LOG.error("Unable to analyze the given text: " + ex, ex);<a name="line.97"></a>
<FONT color="green">098</FONT>                throw new IllegalArgumentException("Unable to analyze the given text: " + ex);<a name="line.98"></a>
<FONT color="green">099</FONT>            }<a name="line.99"></a>
<FONT color="green">100</FONT>        }<a name="line.100"></a>
<FONT color="green">101</FONT>    <a name="line.101"></a>
<FONT color="green">102</FONT>        /**<a name="line.102"></a>
<FONT color="green">103</FONT>         * Returns a list of terms by parsing the given query string - special query characters and words (OR/AND) are<a name="line.103"></a>
<FONT color="green">104</FONT>         * not included in the returned list<a name="line.104"></a>
<FONT color="green">105</FONT>         *<a name="line.105"></a>
<FONT color="green">106</FONT>         * @param queryString the query string to parse<a name="line.106"></a>
<FONT color="green">107</FONT>         * @param analyzerClass the Analyzer Class instance to instantiate, may be null in which case Lucene's<a name="line.107"></a>
<FONT color="green">108</FONT>         * StandardAnalyzer is used<a name="line.108"></a>
<FONT color="green">109</FONT>         * @return a list of text terms<a name="line.109"></a>
<FONT color="green">110</FONT>         */<a name="line.110"></a>
<FONT color="green">111</FONT>        public static String[] termsForQueryString(String queryString, Class analyzerClass) throws ParseException {<a name="line.111"></a>
<FONT color="green">112</FONT>            if (analyzerClass == null) {<a name="line.112"></a>
<FONT color="green">113</FONT>                return termsForQueryString(queryString, (Analyzer) null);<a name="line.113"></a>
<FONT color="green">114</FONT>            }<a name="line.114"></a>
<FONT color="green">115</FONT>            try {<a name="line.115"></a>
<FONT color="green">116</FONT>                return termsForQueryString(queryString, (Analyzer) analyzerClass.newInstance());<a name="line.116"></a>
<FONT color="green">117</FONT>            } catch (Exception ex) {<a name="line.117"></a>
<FONT color="green">118</FONT>                // Convert to unchecked<a name="line.118"></a>
<FONT color="green">119</FONT>                LOG.error("Failed to create instance of Analyzer class [" + analyzerClass + "]: " + ex, ex);<a name="line.119"></a>
<FONT color="green">120</FONT>                throw new IllegalStateException("Failed to create instance of Analyzer class [" + analyzerClass + "]: " + ex);<a name="line.120"></a>
<FONT color="green">121</FONT>            }<a name="line.121"></a>
<FONT color="green">122</FONT>        }<a name="line.122"></a>
<FONT color="green">123</FONT>    <a name="line.123"></a>
<FONT color="green">124</FONT>        /**<a name="line.124"></a>
<FONT color="green">125</FONT>         * Returns a list of terms by parsing the given query string - special query characters and words (OR/AND) are<a name="line.125"></a>
<FONT color="green">126</FONT>         * not included in the returned list<a name="line.126"></a>
<FONT color="green">127</FONT>         *<a name="line.127"></a>
<FONT color="green">128</FONT>         * @param queryString the query string to parse<a name="line.128"></a>
<FONT color="green">129</FONT>         * @param analyzer the Analyzer instance, may be null in which case Lucene's StandardAnalyzer is used<a name="line.129"></a>
<FONT color="green">130</FONT>         * @return a list of text terms<a name="line.130"></a>
<FONT color="green">131</FONT>         * @throws org.apache.lucene.queryParser.ParseException if the query is invalid<a name="line.131"></a>
<FONT color="green">132</FONT>         */<a name="line.132"></a>
<FONT color="green">133</FONT>        public static String[] termsForQueryString(String queryString, Analyzer analyzer) throws ParseException {<a name="line.133"></a>
<FONT color="green">134</FONT>            if (analyzer == null) {<a name="line.134"></a>
<FONT color="green">135</FONT>                analyzer = new StandardAnalyzer();<a name="line.135"></a>
<FONT color="green">136</FONT>            }<a name="line.136"></a>
<FONT color="green">137</FONT>            final String defaultField = "$termsForQueryString_defaultField$";<a name="line.137"></a>
<FONT color="green">138</FONT>            QueryParser queryParser = new QueryParser(defaultField, analyzer);<a name="line.138"></a>
<FONT color="green">139</FONT>            Query query = queryParser.parse(queryString);<a name="line.139"></a>
<FONT color="green">140</FONT>            Set terms = new ListNotSet();<a name="line.140"></a>
<FONT color="green">141</FONT>            query.extractTerms(terms);<a name="line.141"></a>
<FONT color="green">142</FONT>            String[] termsArray = new String[terms.size()];<a name="line.142"></a>
<FONT color="green">143</FONT>            int i = 0;<a name="line.143"></a>
<FONT color="green">144</FONT>            for (Iterator iter = terms.iterator(); iter.hasNext(); ) {<a name="line.144"></a>
<FONT color="green">145</FONT>                termsArray[i++] = ((Term) iter.next()).text();<a name="line.145"></a>
<FONT color="green">146</FONT>            }<a name="line.146"></a>
<FONT color="green">147</FONT>            return termsArray;<a name="line.147"></a>
<FONT color="green">148</FONT>        }<a name="line.148"></a>
<FONT color="green">149</FONT>    <a name="line.149"></a>
<FONT color="green">150</FONT>        /**<a name="line.150"></a>
<FONT color="green">151</FONT>         * Returns an array of {@link Term}s by parsing the given query string. Since Lucene's query parser is used,<a name="line.151"></a>
<FONT color="green">152</FONT>         * special query characters and words (OR / AND) are not included in the returned terms<a name="line.152"></a>
<FONT color="green">153</FONT>         *<a name="line.153"></a>
<FONT color="green">154</FONT>         * @param defaultField The default term field, cannot be null<a name="line.154"></a>
<FONT color="green">155</FONT>         * @param queryString the query string to parse, cannot be null<a name="line.155"></a>
<FONT color="green">156</FONT>         * @param analyzerClass the Class of Analyzer, may be null in which case Lucene's StandardAnalyzer is used<a name="line.156"></a>
<FONT color="green">157</FONT>         * @return the Term array (field + term pairs)<a name="line.157"></a>
<FONT color="green">158</FONT>         * @throws org.apache.lucene.queryParser.ParseException if the the query has invalid syntax<a name="line.158"></a>
<FONT color="green">159</FONT>         */<a name="line.159"></a>
<FONT color="green">160</FONT>        public static Term[] realTermsForQueryString(String defaultField, String queryString, Class analyzerClass) throws ParseException {<a name="line.160"></a>
<FONT color="green">161</FONT>            if (analyzerClass == null) {<a name="line.161"></a>
<FONT color="green">162</FONT>                return realTermsForQueryString(defaultField, queryString, (Analyzer) null);<a name="line.162"></a>
<FONT color="green">163</FONT>            }<a name="line.163"></a>
<FONT color="green">164</FONT>            try {<a name="line.164"></a>
<FONT color="green">165</FONT>                return realTermsForQueryString(defaultField, queryString, (Analyzer) analyzerClass.newInstance());<a name="line.165"></a>
<FONT color="green">166</FONT>            } catch (Exception ex) {<a name="line.166"></a>
<FONT color="green">167</FONT>                // Convert to unchecked<a name="line.167"></a>
<FONT color="green">168</FONT>                LOG.error("Failed to create instance of Analyzer class [" + analyzerClass + "]: " + ex, ex);<a name="line.168"></a>
<FONT color="green">169</FONT>                throw new IllegalStateException("Failed to create instance of Analyzer class [" + analyzerClass + "]: " + ex);<a name="line.169"></a>
<FONT color="green">170</FONT>            }<a name="line.170"></a>
<FONT color="green">171</FONT>        }<a name="line.171"></a>
<FONT color="green">172</FONT>    <a name="line.172"></a>
<FONT color="green">173</FONT>        /**<a name="line.173"></a>
<FONT color="green">174</FONT>         * Returns an array of {@link Term}s by parsing the given query string. Since Lucene's query parser is used,<a name="line.174"></a>
<FONT color="green">175</FONT>         * special query characters and words (OR / AND) are not included in the returned terms<a name="line.175"></a>
<FONT color="green">176</FONT>         *<a name="line.176"></a>
<FONT color="green">177</FONT>         * @param defaultField The default term field, cannot be null<a name="line.177"></a>
<FONT color="green">178</FONT>         * @param queryString the query string to parse, cannot be null<a name="line.178"></a>
<FONT color="green">179</FONT>         * @param analyzer the Analyzer instance, may be null in which case Lucene's StandardAnalyzer is used<a name="line.179"></a>
<FONT color="green">180</FONT>         * @return the Term array (field + term pairs)<a name="line.180"></a>
<FONT color="green">181</FONT>         * @throws org.apache.lucene.queryParser.ParseException if the the query has invalid syntax<a name="line.181"></a>
<FONT color="green">182</FONT>         */<a name="line.182"></a>
<FONT color="green">183</FONT>        public static Term[] realTermsForQueryString(String defaultField, String queryString, Analyzer analyzer) throws ParseException {<a name="line.183"></a>
<FONT color="green">184</FONT>            Assert.notNull(defaultField, "defaultField cannot be null");<a name="line.184"></a>
<FONT color="green">185</FONT>            Assert.notNull(queryString, "queryString cannot be null");<a name="line.185"></a>
<FONT color="green">186</FONT>            if (analyzer == null) {<a name="line.186"></a>
<FONT color="green">187</FONT>                analyzer = new StandardAnalyzer();<a name="line.187"></a>
<FONT color="green">188</FONT>            }<a name="line.188"></a>
<FONT color="green">189</FONT>            QueryParser queryParser = new QueryParser(defaultField, analyzer);<a name="line.189"></a>
<FONT color="green">190</FONT>            Query query = queryParser.parse(queryString);<a name="line.190"></a>
<FONT color="green">191</FONT>            Set terms = new ListNotSet();<a name="line.191"></a>
<FONT color="green">192</FONT>            query.extractTerms(terms);<a name="line.192"></a>
<FONT color="green">193</FONT>            Term[] termsArray = new Term[terms.size()];<a name="line.193"></a>
<FONT color="green">194</FONT>            int i = 0;<a name="line.194"></a>
<FONT color="green">195</FONT>            for (Iterator iter = terms.iterator(); iter.hasNext(); ) {<a name="line.195"></a>
<FONT color="green">196</FONT>                Term term = (Term) iter.next();<a name="line.196"></a>
<FONT color="green">197</FONT>                termsArray[i++] = term;<a name="line.197"></a>
<FONT color="green">198</FONT>            }<a name="line.198"></a>
<FONT color="green">199</FONT>            return termsArray;<a name="line.199"></a>
<FONT color="green">200</FONT>        }<a name="line.200"></a>
<FONT color="green">201</FONT>    <a name="line.201"></a>
<FONT color="green">202</FONT>        // A Set that allows dupes and maintains insertion order, so not really a set :-)<a name="line.202"></a>
<FONT color="green">203</FONT>        private static class ListNotSet extends ArrayList implements Set {<a name="line.203"></a>
<FONT color="green">204</FONT>        }<a name="line.204"></a>
<FONT color="green">205</FONT>    <a name="line.205"></a>
<FONT color="green">206</FONT>        /**<a name="line.206"></a>
<FONT color="green">207</FONT>         * Escape special characters in the given string that would otherwise<a name="line.207"></a>
<FONT color="green">208</FONT>         * cause a parse exception<a name="line.208"></a>
<FONT color="green">209</FONT>         * <a name="line.209"></a>
<FONT color="green">210</FONT>         * @param query the query to escape<a name="line.210"></a>
<FONT color="green">211</FONT>         * @return the escaped query<a name="line.211"></a>
<FONT color="green">212</FONT>         */<a name="line.212"></a>
<FONT color="green">213</FONT>        public static String escapeQuery(String query) {<a name="line.213"></a>
<FONT color="green">214</FONT>            // Note we use the Lucene QueryParser instead of the Compass subclass<a name="line.214"></a>
<FONT color="green">215</FONT>            // because Groovy does not inherit static methods (?)<a name="line.215"></a>
<FONT color="green">216</FONT>            if (query == null) return null;<a name="line.216"></a>
<FONT color="green">217</FONT>            return QueryParser.escape(query);<a name="line.217"></a>
<FONT color="green">218</FONT>        }<a name="line.218"></a>
<FONT color="green">219</FONT>    <a name="line.219"></a>
<FONT color="green">220</FONT>        /**<a name="line.220"></a>
<FONT color="green">221</FONT>         * Returns the query string with special characters removed<a name="line.221"></a>
<FONT color="green">222</FONT>         * <a name="line.222"></a>
<FONT color="green">223</FONT>         * @param query the query to clean<a name="line.223"></a>
<FONT color="green">224</FONT>         * @return the cleaned query<a name="line.224"></a>
<FONT color="green">225</FONT>         */<a name="line.225"></a>
<FONT color="green">226</FONT>        public static String cleanQuery(String query) {<a name="line.226"></a>
<FONT color="green">227</FONT>            StringBuffer sb = new StringBuffer();<a name="line.227"></a>
<FONT color="green">228</FONT>            for (int i = 0; i &lt; query.length(); i++) {<a name="line.228"></a>
<FONT color="green">229</FONT>                char c = query.charAt(i);<a name="line.229"></a>
<FONT color="green">230</FONT>                // These characters are part of the query syntax and must be escaped<a name="line.230"></a>
<FONT color="green">231</FONT>                if (isSpecialQueryCharacter(c)) continue;<a name="line.231"></a>
<FONT color="green">232</FONT>                sb.append(c);<a name="line.232"></a>
<FONT color="green">233</FONT>            }<a name="line.233"></a>
<FONT color="green">234</FONT>            return sb.toString();<a name="line.234"></a>
<FONT color="green">235</FONT>        }<a name="line.235"></a>
<FONT color="green">236</FONT>    <a name="line.236"></a>
<FONT color="green">237</FONT>        /**<a name="line.237"></a>
<FONT color="green">238</FONT>         * Does the given query string contain special characters, ie, those with<a name="line.238"></a>
<FONT color="green">239</FONT>         * special meaning to Lucene's query parser<a name="line.239"></a>
<FONT color="green">240</FONT>         * @param query the query<a name="line.240"></a>
<FONT color="green">241</FONT>         * @return true if it contains special characters<a name="line.241"></a>
<FONT color="green">242</FONT>         */<a name="line.242"></a>
<FONT color="green">243</FONT>        public static boolean queryHasSpecialCharacters(String query) {<a name="line.243"></a>
<FONT color="green">244</FONT>            for (int i = 0; i &lt; query.length(); i++) {<a name="line.244"></a>
<FONT color="green">245</FONT>                char c = query.charAt(i);<a name="line.245"></a>
<FONT color="green">246</FONT>                // These characters are part of the query syntax and must be escaped<a name="line.246"></a>
<FONT color="green">247</FONT>                if (isSpecialQueryCharacter(c)) return true;<a name="line.247"></a>
<FONT color="green">248</FONT>            }<a name="line.248"></a>
<FONT color="green">249</FONT>            return false;<a name="line.249"></a>
<FONT color="green">250</FONT>        }<a name="line.250"></a>
<FONT color="green">251</FONT>    <a name="line.251"></a>
<FONT color="green">252</FONT>        private static boolean isSpecialQueryCharacter(char c) {<a name="line.252"></a>
<FONT color="green">253</FONT>            return SPECIAL_QUERY_CHARACTERS.indexOf(c) &gt; -1;<a name="line.253"></a>
<FONT color="green">254</FONT>        }<a name="line.254"></a>
<FONT color="green">255</FONT>    }<a name="line.255"></a>




























































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